Microscope tube moving mechanism



p 18, 1956 R. DEUTSCHER 2,763,185

MICROSCOPE TUBE MOVING MECHANISM Filed July 30. 1955 United StatesPatent Ofiice Patented Sept. 18, 1956 MICROSCOPE TU'BE MOVING MECHANISMRolf Dentscher, Berlin-Wihnersdorf, Germany, assignor to BerlinerOptische Werkstiitten G. in. b. H., Berlin- Wilmersdorf, Germany, aGerman company Application July 30, 1953, Serial No. 371,236

Claims priority, application Germany August 25, 1952 4 Claims. (Cl.88-39) This invention relates to an improvement in the focusing of thetube on microscopes, such as was formerly effected by means of a pinionand rack.

According to the present invention, the focusing adjustment issimplified by the fact that a pivoted lever acting on the tube isprovided for lifting and lowering the said tube. Preferably, the tubeand the lever are under the action of tension and compression springswhich produce a mass balance. A screw, formed with microthread, isprovided which acts as a stop and as a means whereby fine focusing ofthe microscope may be eifected. The pivoted arm is guided through arecess in the arm of the microscope.

The present invention will now be more particularly described withreference to the accompanying drawing, in which:

A microscope arm 1, which supports the tube 2 for vertical movement in amanner known per se, carries a pivoted lever 3 which is mounted by meansof a pin 5 in a recess 4 of the said microscope arm 1. The pivoted lever3 engages beneath a pin 6 or the like on the tube 2 and can move thelatter upwardly under the tension of a spring. The downward movement iseifected by a tension spring 7 and a compression spring 8 serves forbalancing the forces on the lever 3. The downward movement of thepivoted lever 3 is limited by a stop 9 which is formed by screws 10which are formed with micro-threads and which. can be moved by a knurledwheel 11 in the arm 1 and by means of which fine focusing of themicroscope may be elfected. The movement of the pivoted lever 3 in theupward direction may be limited by a stop 12.

The construction according to the invention provides the result thatwhen using relatively balanced objectives, upon bringing into useanother (higher or lower) magnification, the subject to be examined isto be seen again immediately after engaging the turret mounting. It isno longer necessary to search for this image by adjust ment of thecustomary coarse adjustment mechanism,

since the tube always remains at the same place after lifting by meansof the pivoted lever 3.

In this way, it is possible with series examinations for the preparationto be examined to be changed in a considerably shorter time. Thedisturbing wear on the toothed gearing such as is at present employedfor the coarse adjustment can no longer become noticeable, since toothedgearing is not provided.

What I claim as my invention and desire to secure by Letters Patent ofthe United States is:

1. A microscope comprising a support, a tube carried by the support andslidable vertically thereon, abutment means extending laterally from thetube, a lever having a first end and a second end, means pivotallymounting the lever to the support intermediate the ends of the lever forpivotal movement of the lever about a horizontal axis, said first end ofthe lever engaging under the abutment means and said second endextending outwardly from the support for manual engagement in moving thefirst end of the lever upwardly to raise the tube, first spring meansconnected between the tube and the support to normally urge the tubedownwardly, second spring means connected between the support and thelever intermediate the first end and the pivotal mounting means fornormally urging the first end of the lever upwardly and a micro-threadedscrew carried by the support beneath the lever and engaging the leveradjacent its first end and acting as a stop for said lever and actingthrough said lever as a fine adjustment.

2. A microscope as claimed in claim 1, wherein said first spring meansincludes a vertically disposed tension spring secured at one end to theabutment means and at its other end to the support.

3. A microscope as claimed in claim 2, wherein said second spring meansincludes a compression spring hearing between the lever and the supportand cooperating with the tension spring to balance the forces on thelever.

4. A microscope as claimed in claim 1, wherein said support includes ahorizontal arm carrying the tube at its outer end and having a recess inits upper portion in which the lever is pivoted.

References Cited in the file of this patent UNITED STATES PATENTS1,863,673 Schroven June 21, 1932 2,677,987 Gallasch May 11, 1954 FOREIGNPATENTS 8,992 Great Britain 1900 11,261 Great Britain 1901 19,161 GreatBritain 1914 595,727 GreafBritain Dec. 15, 1947

